1531616987 has 2 divisors, whose sum is σ = 1531616988. Its totient is φ = 1531616986.

The previous prime is 1531616959. The next prime is 1531617001. The reversal of 1531616987 is 7896161351.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1531616987 - 2²⁸ = 1263181531 is a prime.

It is not a weakly prime, because it can be changed into another prime (1531618987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 765808493 + 765808494.

It is an arithmetic number, because the mean of its divisors is an integer number (765808494).

Almost surely, 2^1531616987 is an apocalyptic number.

1531616987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1531616987 is an equidigital number, since it uses as much as digits as its factorization.

1531616987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 272160, while the sum is 47.

The square root of 1531616987 is about 39135.8785132006. The cubic root of 1531616987 is about 1152.7011456695.

The spelling of 1531616987 in words is "one billion, five hundred thirty-one million, six hundred sixteen thousand, nine hundred eighty-seven".